2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 /* mtd interface for YAFFS2 */
17 #include "yaffs_trace.h"
19 #include "yaffs_mtdif2.h"
21 #include "linux/mtd/mtd.h"
22 #include "linux/types.h"
23 #include "linux/time.h"
25 #include "yaffs_packedtags2.h"
27 #include "yaffs_linux.h"
29 /* NB For use with inband tags....
30 * We assume that the data buffer is of size total_bytes_per_chunk so that we can also
31 * use it to load the tags.
33 int nandmtd2_write_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
35 const struct yaffs_ext_tags *tags)
37 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
38 struct mtd_oob_ops ops;
43 struct yaffs_packed_tags2 pt;
45 int packed_tags_size =
46 dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
47 void *packed_tags_ptr =
48 dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
52 ("nandmtd2_write_chunk_tags chunk %d data %p tags %p"
53 TENDSTR), nand_chunk, data, tags));
55 addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
57 /* For yaffs2 writing there must be both data and tags.
58 * If we're using inband tags, then the tags are stuffed into
59 * the end of the data buffer.
63 else if (dev->param.inband_tags) {
64 struct yaffs_packed_tags2_tags_only *pt2tp;
66 (struct yaffs_packed_tags2_tags_only *)(data +
68 data_bytes_per_chunk);
69 yaffs_pack_tags2_tags_only(pt2tp, tags);
71 yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
73 ops.mode = MTD_OOB_AUTO;
74 ops.ooblen = (dev->param.inband_tags) ? 0 : packed_tags_size;
75 ops.len = dev->param.total_bytes_per_chunk;
77 ops.datbuf = (u8 *) data;
78 ops.oobbuf = (dev->param.inband_tags) ? NULL : packed_tags_ptr;
79 retval = mtd->write_oob(mtd, addr, &ops);
87 int nandmtd2_read_chunk_tags(struct yaffs_dev *dev, int nand_chunk,
88 u8 * data, struct yaffs_ext_tags *tags)
90 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
91 struct mtd_oob_ops ops;
97 loff_t addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
99 struct yaffs_packed_tags2 pt;
101 int packed_tags_size =
102 dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
103 void *packed_tags_ptr =
104 dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
108 ("nandmtd2_read_chunk_tags chunk %d data %p tags %p"
109 TENDSTR), nand_chunk, data, tags));
111 if (dev->param.inband_tags) {
115 data = yaffs_get_temp_buffer(dev, __LINE__);
120 if (dev->param.inband_tags || (data && !tags))
121 retval = mtd->read(mtd, addr, dev->param.total_bytes_per_chunk,
124 ops.mode = MTD_OOB_AUTO;
125 ops.ooblen = packed_tags_size;
126 ops.len = data ? dev->data_bytes_per_chunk : packed_tags_size;
129 ops.oobbuf = yaffs_dev_to_lc(dev)->spare_buffer;
130 retval = mtd->read_oob(mtd, addr, &ops);
133 if (dev->param.inband_tags) {
135 struct yaffs_packed_tags2_tags_only *pt2tp;
137 (struct yaffs_packed_tags2_tags_only *)&data[dev->
138 data_bytes_per_chunk];
139 yaffs_unpack_tags2_tags_only(tags, pt2tp);
143 memcpy(packed_tags_ptr,
144 yaffs_dev_to_lc(dev)->spare_buffer,
146 yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
151 yaffs_release_temp_buffer(dev, data, __LINE__);
153 if (tags && retval == -EBADMSG
154 && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
155 tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
156 dev->n_ecc_unfixed++;
158 if (tags && retval == -EUCLEAN
159 && tags->ecc_result == YAFFS_ECC_RESULT_NO_ERROR) {
160 tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
169 int nandmtd2_mark_block_bad(struct yaffs_dev *dev, int block_no)
171 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
174 (TSTR("nandmtd2_mark_block_bad %d" TENDSTR), block_no));
177 mtd->block_markbad(mtd,
178 block_no * dev->param.chunks_per_block *
179 dev->param.total_bytes_per_chunk);
188 int nandmtd2_query_block(struct yaffs_dev *dev, int block_no,
189 enum yaffs_block_state *state, u32 * seq_number)
191 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
194 T(YAFFS_TRACE_MTD, (TSTR("nandmtd2_query_block %d" TENDSTR), block_no));
196 mtd->block_isbad(mtd,
197 block_no * dev->param.chunks_per_block *
198 dev->param.total_bytes_per_chunk);
201 T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
203 *state = YAFFS_BLOCK_STATE_DEAD;
206 struct yaffs_ext_tags t;
207 nandmtd2_read_chunk_tags(dev, block_no *
208 dev->param.chunks_per_block, NULL, &t);
211 *seq_number = t.seq_number;
212 *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
215 *state = YAFFS_BLOCK_STATE_EMPTY;
219 (TSTR("block is bad seq %d state %d" TENDSTR), *seq_number, *state));